Steen Jørgensen / MCP3204

2.7V 4-Channel 12-Bit A/D Converters with SPI™ Serial Interface

Fork of MCP3204 by TeamElectronics

MCP3204.cpp@1:cf7328552994, 2016-01-20 (annotated)

Committer:
stjo2809
Date:
Wed Jan 20 10:53:06 2016 +0000
Revision:
1:cf7328552994
Parent:
0:b5950cd5e330 
Tested

Who changed what in which revision?

UserRevisionLine numberNew contents of line
stjo2809 1:cf7328552994 1 /* mbed MCP3204 Library, for driving the 2.7V 4-Channel 12-Bit A/D Converters with SPI™ Serial Interface
stjo2809 0:b5950cd5e330 2 * Copyright (c) 2015, Created by Steen Joergensen (stjo2809)
stjo2809 0:b5950cd5e330 3 *
stjo2809 0:b5950cd5e330 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
stjo2809 0:b5950cd5e330 5 * of this software and associated documentation files (the "Software"), to deal
stjo2809 0:b5950cd5e330 6 * in the Software without restriction, including without limitation the rights
stjo2809 0:b5950cd5e330 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
stjo2809 0:b5950cd5e330 8 * copies of the Software, and to permit persons to whom the Software is
stjo2809 0:b5950cd5e330 9 * furnished to do so, subject to the following conditions:
stjo2809 0:b5950cd5e330 10 *
stjo2809 0:b5950cd5e330 11 * The above copyright notice and this permission notice shall be included in
stjo2809 0:b5950cd5e330 12 * all copies or substantial portions of the Software.
stjo2809 0:b5950cd5e330 13 *
stjo2809 0:b5950cd5e330 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
stjo2809 0:b5950cd5e330 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
stjo2809 0:b5950cd5e330 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
stjo2809 0:b5950cd5e330 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
stjo2809 0:b5950cd5e330 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
stjo2809 0:b5950cd5e330 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
stjo2809 0:b5950cd5e330 20 * THE SOFTWARE.
stjo2809 0:b5950cd5e330 21 */
stjo2809 0:b5950cd5e330 22
stjo2809 0:b5950cd5e330 23 #include "mbed.h"
stjo2809 0:b5950cd5e330 24 #include "MCP3204.h"
stjo2809 0:b5950cd5e330 25
stjo2809 0:b5950cd5e330 26 //=============================================================================
stjo2809 0:b5950cd5e330 27 // Public functions
stjo2809 0:b5950cd5e330 28 //=============================================================================
stjo2809 0:b5950cd5e330 29
stjo2809 0:b5950cd5e330 30 MCP3204::MCP3204(SPI& spi, PinName nCs) : _spi(spi), _nCs(nCs)
stjo2809 0:b5950cd5e330 31 {
stjo2809 1:cf7328552994 32 _nCs = 1; _nCs = 0; _nCs = 1;
stjo2809 0:b5950cd5e330 33 }
stjo2809 0:b5950cd5e330 34
stjo2809 0:b5950cd5e330 35 int MCP3204::sgl(char channel)
stjo2809 0:b5950cd5e330 36 {
stjo2809 0:b5950cd5e330 37 return _read(SINGLE, channel);
stjo2809 0:b5950cd5e330 38 }
stjo2809 0:b5950cd5e330 39
stjo2809 0:b5950cd5e330 40 int MCP3204::diff(char channel)
stjo2809 0:b5950cd5e330 41 {
stjo2809 0:b5950cd5e330 42 return _read(DIFFERENTIAL, channel);
stjo2809 0:b5950cd5e330 43 }
stjo2809 0:b5950cd5e330 44
stjo2809 0:b5950cd5e330 45 //=============================================================================
stjo2809 0:b5950cd5e330 46 // Private functions
stjo2809 0:b5950cd5e330 47 //=============================================================================
stjo2809 0:b5950cd5e330 48
stjo2809 0:b5950cd5e330 49 int MCP3204::_make_value_from_responce(int _msb, int _lsb)
stjo2809 0:b5950cd5e330 50 {
stjo2809 1:cf7328552994 51 int responce = _msb << 8;
stjo2809 1:cf7328552994 52 responce = responce | _lsb;
stjo2809 1:cf7328552994 53 responce = responce & 0xfff;
stjo2809 1:cf7328552994 54
stjo2809 1:cf7328552994 55 return responce;
stjo2809 0:b5950cd5e330 56 }
stjo2809 0:b5950cd5e330 57
stjo2809 0:b5950cd5e330 58 int MCP3204::_read(char sgl_or_diff, char channel)
stjo2809 0:b5950cd5e330 59 {
stjo2809 0:b5950cd5e330 60 _nCs = 0;
stjo2809 0:b5950cd5e330 61 _spi.write(sgl_or_diff);
stjo2809 0:b5950cd5e330 62 int responce_msb = _spi.write(channel);
stjo2809 0:b5950cd5e330 63 int responce_lsb = _spi.write(0xff); // don't care bits
stjo2809 0:b5950cd5e330 64 _nCs = 1;
stjo2809 0:b5950cd5e330 65
stjo2809 0:b5950cd5e330 66 int responce = _make_value_from_responce(responce_msb, responce_lsb);
stjo2809 0:b5950cd5e330 67
stjo2809 0:b5950cd5e330 68 return responce;
stjo2809 1:cf7328552994 69 }